Modeling the discoloration of a mixture of reactive textile dyes by commercial laccase
authors Cristovao, RO; Tavares, APM; Ferreira, LA; Loureiro, JM; Boaventura, RAR; Macedo, EA
nationality International
journal BIORESOURCE TECHNOLOGY
author keywords Dyes mixture; Discoloration; Commercial laccase; Enzyme kinetics; Modeling
keywords AZO DYES; CATALYZED DECOLORIZATION; IMMOBILIZED LACCASE; TRAMETES-HIRSUTA; SYNTHETIC DYES; RANDOM-SEARCH; WASTE-WATER; DEGRADATION; DECOLOURIZATION; DETOXIFICATION
abstract Degradation of a mixture of three reactive textile dyes (Reactive Black 5, Reactive Yellow 15 and Reactive Red 239), simulating a real textile effluent, by commercial laccase, was investigated in a batch reactor. The discoloration was appraised as a percentage of the absorbance reduction at the wavelength of maximum absorbance for each dye and as total color removal based in all visible spectrum. A significantly high discoloration was achieved in both cases, indicating the applicability of this method for textile wastewater treatment. Mathematical models were developed to simulate the kinetics of laccase catalyzed degradation of reactive dyes in mixtures. Like in single dye degradation, some of the reactions present an unusual kinetic behavior, corresponding to the activation of the laccase-mediator system. The kinetic constants of the models were estimated by minimizing the difference between the predicted and the experimental time courses. Although not perfect, the ability of the models in representing the experimental results suggests that they could be used in design and simulation applications. (c) 2008 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0960-8524
year published 2009
volume 100
issue 3
beginning page 1094
ending page 1099
digital object identifier (doi) 10.1016/j.biortech.2008.08.007
web of science category Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels
subject category Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
unique article identifier WOS:000261569100009
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